a resulting eight possible psychological types. People tend to find using their opposite psychological preferences more difficult, even if they can become more proficient (and therefore behaviorally flexible) with practice and development. The four functions operate in conjunction with the attitudes (extraversion and introversion). Each function is used in either an extraverted or introverted way. A person whose dominant function is extraverted intuition, for example, uses intuition very differently from someone whose dominant function is introverted intuition. The eight psychological types are as follows: Extraverted sensation Introverted sensation Extraverted intuition Introverted intuition Extraverted thinking Introverted thinking Extraverted feeling Introverted feeling Jung theorized that the dominant function characterizes consciousness, while its opposite is repressed and characterizes unconscious activity. Generally, we tend to favor our most developed dominant function, while we can broaden our personality by developing the others. Related to this, Jung noted that the unconscious often tends to reveal itself most easily through a person's least developed inferior function. The encounter with the unconscious and development of the underdeveloped functions thus tend to progress together. When the unconscious inferior functions fail to develop, imbalance results. In Psychological Types, Jung describes in detail the effects of tensions between the complexes associated with the dominant and inferior differentiating functions in highly one-sided individuals. Personality types and worrying The relationship between worry – the tendency of one's thoughts and mental images to revolve around and create negative emotions, and the experience of a frequent level of fear – and Jung's model of psychological types has been the subject of studies. In particular, correlational analysis has shown that the tendency to worry is significantly related to Jung's Introversion and Feeling dimensions. Similarly, worry has shown robust correlations with shyness and fear of social situations. The worrier's tendency to be fearful of social situations might make them appear more withdrawn. Jung's model suggests that the superordinate dimension of personality is introversion and extraversion. Introverts are likely to relate to the external world by listening, reflecting, being reserved, and having focused interests. Extraverts on the other hand, are adaptable and in tune with the external world. They prefer interacting with the outer world by talking, actively participating, being sociable, expressive, and having a variety of interests. Jung (1921) also identified two other dimensions of personality: Intuition - Sensing and Thinking - Feeling. Sensing types tend to focus on the reality of present situations, pay close attention